100=(.5*X)+(.4*3x)

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Solution for 100=(.5*X)+(.4*3x) equation: 


Simplifying
100 = (0.5X) + (0.4 * 3x)

Multiply 0.4 * 3
100 = (0.5X) + (1.2x)

Solving
100 = (0.5X) + (1.2x)

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '(-0.5X)' to each side of the equation.
100 + (-0.5X) = (0.5X) + (-0.5X) + (1.2x)

Combine like terms: (0.5X) + (-0.5X) = 0.0
100 + (-0.5X) = 0.0 + (1.2x)
100 + (-0.5X) = (1.2x)

Add '-100' to each side of the equation.
100 + -100 + (-0.5X) = -100 + (1.2x)

Combine like terms: 100 + -100 = 0
0 + (-0.5X) = -100 + (1.2x)
(-0.5X) = -100 + (1.2x)

Divide each side by '-0.5'.
X = 200 + (-2.4x)

Simplifying
X = 200 + (-2.4x)

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